Tempo:
Casement and awning windows swing open to the exterior and are among the more expensive types. They are very airtight and offer good resistance to forced entry. The entire window area can be open for ventilation. Casement windows are well suited to deflecting prevailing winds into the dwelling for natural ventilation and passive cooling. Awning windows have the advantage of shedding rain effectively when open.
Low-Emissivity Coatings
Tilt-and-turn windows are the most flexible of all window types. Some can act like casement and awning windows. Similar to casements, the entire window area can be open for ventilation. These windows can be very airtight when fitted with compression-type closing devices.
Much of the heat lost and gained through a window is due to radiation, a process whereby warmer objects radiate heat to cooler objects, as in the case of sunlight passing through a window and warming objects in a room. Low-emissivity (low-E) coating is a thin metallic film deposited on glass that acts as a mirror to radiate heat back into a room during cold weather, and back to the outdoors during hot weather, thereby reducing heating and cooling bills. It provides a double-glazed window with about the same energy performance as a window with uncoated triple-glazing, but at less additional cost. Many window manufacturers offer low-E glazing as a standard feature.
Window Performance
Gas Fills
Several technological advances have vastly improved the performance of windows over the past 20 years.
Another innovation is the use of inert gas between layers of glass in a sealed unit in the place of air. Inert gases have a higher insulating value than air because they are heavier, resulting in lower convective and conductive heat losses between the panes of glass. Argon is the most commonly used gas due to its availability and low cost. Many window manufacturers offer windows made with inert, gas-sealed units.
Multiple Glass Layers Condensation on interior window surfaces can be reduced by installing energy-efficient windows, using efficient glazing and low-conductivity frames. Each layer of glass and air space works to increase the inside surface temperature of the innermost layer of glass, thereby reducing the potential for condensation. Windows that separate heated space from unheated space or the exterior must be at least double-glazed. Some condensation around the edges of windows can be expected during cold weather, particularly if the humidity in a house is high. Double-and triple-glazed windows with glazing that have low-conductivity edge seals and low-conductivity frames create warmer interior surface temperatures and reduce the potential for condensation.
Solar Heat Gain Coefficient The solar heat gain coefficient (SHGC) is the fraction of incident solar radiation admitted through a window, both directly transmitted and absorbed and subsequently released inward. It is expressed as a number between 0 and 1. The lower a window’s solar heat gain coefficient, the less solar heat it transmits. Solar heat gain can provide free heat in the winter but can also lead to overheating in the summer. The appropriate SHGC for a given window depends on the climate, orientation, shading conditions and other factors.
Low-Emissivity Coatings
Tilt-and-turn windows are the most flexible of all window types. Some can act like casement and awning windows. Similar to casements, the entire window area can be open for ventilation. These windows can be very airtight when fitted with compression-type closing devices.
Much of the heat lost and gained through a window is due to radiation, a process whereby warmer objects radiate heat to cooler objects, as in the case of sunlight passing through a window and warming objects in a room. Low-emissivity (low-E) coating is a thin metallic film deposited on glass that acts as a mirror to radiate heat back into a room during cold weather, and back to the outdoors during hot weather, thereby reducing heating and cooling bills. It provides a double-glazed window with about the same energy performance as a window with uncoated triple-glazing, but at less additional cost. Many window manufacturers offer low-E glazing as a standard feature.
Window Performance
Gas Fills
Several technological advances have vastly improved the performance of windows over the past 20 years.
Another innovation is the use of inert gas between layers of glass in a sealed unit in the place of air. Inert gases have a higher insulating value than air because they are heavier, resulting in lower convective and conductive heat losses between the panes of glass. Argon is the most commonly used gas due to its availability and low cost. Many window manufacturers offer windows made with inert, gas-sealed units.
Multiple Glass Layers Condensation on interior window surfaces can be reduced by installing energy-efficient windows, using efficient glazing and low-conductivity frames. Each layer of glass and air space works to increase the inside surface temperature of the innermost layer of glass, thereby reducing the potential for condensation. Windows that separate heated space from unheated space or the exterior must be at least double-glazed. Some condensation around the edges of windows can be expected during cold weather, particularly if the humidity in a house is high. Double-and triple-glazed windows with glazing that have low-conductivity edge seals and low-conductivity frames create warmer interior surface temperatures and reduce the potential for condensation.
Solar Heat Gain Coefficient The solar heat gain coefficient (SHGC) is the fraction of incident solar radiation admitted through a window, both directly transmitted and absorbed and subsequently released inward. It is expressed as a number between 0 and 1. The lower a window’s solar heat gain coefficient, the less solar heat it transmits. Solar heat gain can provide free heat in the winter but can also lead to overheating in the summer. The appropriate SHGC for a given window depends on the climate, orientation, shading conditions and other factors.
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